In Norse mythology, Heiðrún is the goat that provides mead for the warriors of Valhalla.
Heiðrún stands on the roof of Valhalla and eats the leaves of the tree or plant called Læraðr. From her udders flows mead, which is served to the einherjar at their feasts. The detail appears in Grímnismál, one of the mythological poems of the Poetic Edda.
The story gives Valhalla a second supernatural food source alongside Sæhrímnir, the boar that is eaten and restored daily. Together, they explain how the hall can sustain an enormous company of warriors through endless cycles of combat and celebration.
Heiðrún is often confused with Audhumbla, the primeval cow in Norse creation mythology. Audhumbla nourishes the giant Ymir with her milk, whereas Heiðrún produces mead for Odin’s chosen dead. Their different animals and roles belong to separate mythic episodes.